# Ampere unit

### Ampere definition

Ampere or amp (symbol: A) is the unit of electrical current.

The Ampere unit is named after Andre-Marie Ampere, from France.

One Ampere is defined as the current that flows with electric charge of one Coulomb per second.

1 A = 1 C/s

### Amperemeter

Ampere meter or ammeter is an electrical instrument that is used to measure electrical current in amperes.

When we want to measure the electrical current on the load, the ampere-meter is connected in series to the load.

The resistance of the ampere-meter is near zero, so it will not affect the measured circuit.

### Table of ampere unit prefixes

name symbol conversion example
microampere (microamps) μA 1μA = 10-6A I = 50μA
milliampere (milliamps) mA 1mA = 10-3A I = 3mA
ampere (amps) A

-

I = 10A
kiloampere (kiloamps) kA 1kA = 103A I = 2kA

### How to convert amps to microamps (μA)

The current I in microamperes (μA) is equal to the current I in amperes (A) divided by 1000000:

I(μA) = I(A) / 1000000

### How to convert amps to milliamps (mA)

The current I in milliamperes (mA) is equal to the current I in amperes (A) divided by 1000:

I(mA) = I(A) / 1000

### How to convert amps to kiloamps (kA)

The current I in kiloamperes (mA) is equal to the current I in amperes (A) times 1000:

I(kA) = I(A) ⋅ 1000

### How to convert amps to watts (W)

The power P in watts (W) is equal to the current I in amps (A) times the voltage V in volts (V):

P(W) = I(A)V(V)

### How to convert amps to volts (V)

The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in amperes (A):

V(V) = P(W) / I(A)

The voltage V in volts (V) is equal to the current I in amperes (A) times the resistance R in ohms (Ω):

V(V) = I(A)R(Ω)

### How to convert amps to ohms (Ω)

The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amperes (A):

R(Ω) = V(V) / I(A)

### How to convert amps to kilowatts (kW)

The power P in kilowatts (kW) is equal to the current I in amps (A) times the voltage V in volts (V) divided by 1000:

P(kW) = I(A)V(V) / 1000

### How to convert amps to kilovolt-ampere (kVA)

The apparent power S in kilovolt-amps (kVA) is equal to RMS current IRMS in amps (A), times the RMS voltage VRMS in volts (V), divided by 1000:

S(kVA) = IRMS(A)VRMS(V) / 1000

### How to convert amps to coulombs (C)

The electric charge Q in coulombs (C) is equal to the current I in amps (A), times the time of current flow t in seconds (s):

Q(C) = I(A)t(s)